Expressions. Operands. Operators
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1 Página 1 de 6 Expressions The Assembler incorporates constant expressions. Expressions can consist of operands, operators and functions. All expressions are internally 32 bits in AVRASM, and 64 bits in AVRASM2. Operands The following operands can be used: User defined labels which are given the value of the location counter at the place they appear. User defined variables defined by the SET directive User defined constants defined by the EQU directive Integer constants: constants can be given in several formats, including Decimal (default): 10, 255 Hexadecimal (two notations): 0x0a, $0a, 0xff, $ff Binary: 0b , 0b Octal (leading zero): 010, 077 PC - the current value of the Program memory location counter Floating point constants - AVRASM2 only. Operators The Assembler supports a number of operators which are described here. The higher the precedence, the higher the priority. Expressions may be enclosed in parentheses, and such expressions are always evaluated before combined with anything outside the parentheses. The associativity of binary operators indicates the evaluation order of chained operators, left associativity meaning they are evaluated left to right, i.e., is (2-3) - 4, while right associativity would mean is 2 - (3-4). Some operators are not assoiciative, meaning chaining has no meaning. The following operators are defined: Symbol Description! Logical Not ~ Bitwise Not - Unary Minus * Multiplication / Division % Modulo (AVRASM2 only) + Addition - Subtraction << Shift left >> Shift right < Less than <= Less than or equal > Greater than >= Greater than or equal == Equal
2 Página 2 de 6!= Not equal & Bitwise And ^ Bitwise Xor Bitwise Or && Logical And Logical Or Conditional operator? (AVRASM2 only) Logical Not Symbol:! Description: Unary operator which returns 1 if the expression was zero, and returns 0 if the expression was nonzero Example: ldi r16,!0xf0 ; Load r16 with 0x00 Bitwise Not Symbol: ~ Description: Unary operator which returns the input expression with all bits inverted Example: ldi r16,~0xf0 ; Load r16 with 0x0f Unary Minus Symbol: - Description: Unary operator which returns the arithmetic negation of an expression Precedence: 14 Example: ldi r16,-2 ; Load -2(0xfe) in r16 Multiplication Symbol: * Description: Binary operator which returns the product of two expressions Precedence: 13 Example: ldi r30,label*2 ; Load r30 with label*2 Division Symbol: / Description: Binary operator which returns the integer quotient of the left expression divided by the right expression Precedence: 13 Example: ldi r30,label/2 ; Load r30 with label/2
3 Página 3 de 6 Modulo (AVRASM2 Only) Symbol: % Description: Binary operator which returns the integer remainder of the left expression divided by the right expression Precedence: 13 Example: ldi r30,label%2 ; Load r30 with label%2 Addition Symbol: + Description: Binary operator which returns the sum of two expressions Example: ldi r30,c1+c2 ; Load r30 with c1+c2 Subtraction Symbol: - Description: Binary operator which returns the left expression minus the right expression Example: ldi r17,c1-c2 ;Load r17 with c1-c2 Shift left Symbol: << Description: Binary operator which returns the left expression shifted left the number given by the right expression Precedence: 11 Example: ldi r17,1<<bitmask ;Load r17 with 1 shifted left bitmask times Shift right Symbol: >> Description: Binary operator which returns the left expression shifted right the number given by the right expression Precedence: 11 Example: ldi r17,c1>>c2 ;Load r17 with c1 shifted right c2 times Less than Symbol: < left is Less than the signed expression to the right, 0 otherwise Example: ori r18,bitmask*(c1<c2)+1 ;Or r18 with an expression
4 Página 4 de 6 Less or equal Symbol: <= left is Less than or Equal to the signed expression to the right, 0 otherwise Example: ori r18,bitmask*(c1<=c2)+1 ;Or r18 with an expression Greater than Symbol: > left is Greater than the signed expression to the right, 0 otherwise Example: ori r18,bitmask*(c1>c2)+1 ;Or r18 with an expression Greater or equal Symbol: >= left is Greater than or Equal to the signed expression to the right, 0 otherwise Example: ori r18,bitmask*(c1>=c2)+1 ;Or r18 with an expression Equal Symbol: == left is Equal to the signed expression to the right, 0 otherwise Precedence: 9 Example: andi r19,bitmask*(c1==c2)+1 ;And r19 with an expression Not equal Symbol:!= left is Not Equal to the signed expression to the right, 0 otherwise Precedence: 9 Example:.SET flag=(c1!=c2) ;Set flag to 1 or 0 Bitwise And Symbol: & Description: Binary operator which returns the bitwise And between two expressions Precedence: 8
5 Página 5 de 6 Example: ldi r18,high(c1&c2) ;Load r18 with an expression Bitwise Xor Symbol: Description: expressions Precedence: 7 ^ Binary operator which returns the bitwise Exclusive Or between two Example: ldi r18,low(c1^c2) ;Load r18 with an expression Bitwise Or Symbol: Description: Binary operator which returns the bitwise Or between two expressions Precedence: 6 Example: ldi r18,low(c1 c2) ;Load r18 with an expression Logical And Symbol: Description: nonzero, 0 otherwise Precedence: 5 && Binary operator which returns 1 if the expressions are both Example: ldi r18,low(c1&&c2) ;Load r18 with an expression Logical Or Symbol: Description: Binary operator which returns 1 if one or both of the expressions are nonzero, 0 otherwise Precedence: 4 Example: ldi r18,low(c1 c2) ;Load r18 with an expression Conditional operator (AVRASM2 only) Symbol:? : Syntax: condtion? expression1 : expression2 Description: Ternary operator which returns expression1 if condition is true, expression2 otherwise. Precedence: 3 Example: ldi r18, a > b? a : b ; Load r18 with the maximum numeric value of a and b. Note: This feature was introduced in AVRASM 2.1 and is not available in 2.0 or earlier versions. Functions The following functions are defined: LOW(expression) returns the low byte of an expression
6 Página 6 de 6 HIGH(expression) returns the second byte of an expression BYTE2(expression) is the same function as HIGH BYTE3(expression) returns the third byte of an expression BYTE4(expression) returns the fourth byte of an expression LWRD(expression) returns bits 0-15 of an expression HWRD(expression) returns bits of an expression PAGE(expression) returns bits of an expression EXP2(expression) returns 2 to the power of expression LOG2(expression) returns the integer part of log2(expression) The following functions are only defined in AVRASM2: INT(expression) Truncates a floating point expression to integer (ie discards fractional part) FRAC(expression) Extracts fractional part of a floating point expression (ie discards integer part). Q7(expression) Converts a fractional floating point expression to a form suitable for the FMUL/FMULS/FMULSU instructions. (sign + 7-bit fraction) Q15(expression) Converts a fractional floating point expression to a form suitable for the FMUL/FMULS/FMULSU instructions. (sign +15-bit fraction) ABS() Returns the absolute value of a constant expression. DEFINED(symbol) Returns true if symbol is previously defined using.equ/.set/.def directives. Normally used in conjunction with.if directives (.if defined(foo)), but may be used in any context. It differs from other functions in that parentheses around its argument are not required, and that it only makes sense to use a single symbol as argument. STRLEN(string) returns the length of a string c+onstant, in bytes.
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